*{
    padding: 0;
    margin: 0;
}
form{
    width: 600px;
    margin:20px auto;
}

form > fieldset{
    padding: 10px;
}

form > fieldset > meter,
form > fieldset > input{
    width: 100%;
    height: 40px;
    line-height: 40px;
    margin:10px 0;
    border: none;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    padding-left:5px;
    /*width=内容+padding+border*/
    box-sizing: border-box;
}
form > fieldset > meter{
    padding-left:0px;
}